Biotite-quartz-plagioclase gneiss, amphibolite, and related migmatite

Locally sillimanitic; commonly garnetiferous in and adjacent to Adirondack Highlands.
State New York
Name Biotite-quartz-plagioclase gneiss, amphibolite, and related migmatite
Geologic age Middle Proterozoic
Lithologic constituents
Major
Metamorphic > Gneiss > Biotite-gneissBiotite-quartz-plagioclase gneiss
Minor
Metamorphic > Amphibolite
Metamorphic > Migmatite
References

Fisher, D.W., Isachsen, Y.W., and Rickard, L.V., 1970, Geologic Map of New York State, consisting of 5 sheets: Niagara, Finger Lakes, Hudson-Mohawk, Adirondack, and Lower Hudson, New York State Museum and Science Service, Map and Chart Series No. 15, scale 1:250,000.

NGMDB product
Counties Fulton - Hamilton - Saratoga - Warren - Washington